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Tungsten plates on the market in 2010 ( Plansee – Cime Bocuze )

Tungsten plates on the market in 2010 ( Plansee – Cime Bocuze ). Pure W – W Composite Production Process Available Products Mechanical and Magnetic Properties Preliminary Ideas for a Prototype. CLIC physics/detector meeting 17 June 2009. W. Klempt CERN/PH. W – W Composite Material.

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Tungsten plates on the market in 2010 ( Plansee – Cime Bocuze )

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  1. Tungsten plates on the market in 2010( Plansee – Cime Bocuze ) • Pure W – W Composite • Production Process • Available Products • Mechanical and Magnetic Properties • Preliminary Ideas for a Prototype CLIC physics/detector meeting 17 June 2009 W. Klempt CERN/PH

  2. W – W Composite Material • Pure W is difficult to use: • pretty brittle • Difficult to machine • W composite materials: • Consist of W (≥ 90%) rest mixture of Fe, Ni, Cu … •  = 17 – 19 g/cm3 • Λ ≈ 10 cm, X0 ≈ 0.4 cm • Well established production procedure • Easy to machine • Price ~ 70 Euro/kg

  3. Production Process of Tungsten Composite Materials

  4. Product Range and Material Properties

  5. Mechanical Properties

  6. Magnetic properties of Densimet 180

  7. Magnetic properties of Densimet 180 μ

  8. Maximum size • Maximum size is given by size of the oven • Today a reasonable maximum size is about 1 ton of product. • In case of 10 – mm - thick plates the maximum size is about 500 mm x 800 mm after cutting and machining. • Rolling is complicate: hard phase (tungsten) mixed with ductile phase (CuNi). Brittleness increases!

  9. A promising technique - extrusion • Powder is mixed with a polyimide (nylon or similar). • The mixture is extruded. • First pre-sintering process (~800 oC). • Final sintering. • Option – rolling to straighten the plates – not to change thickness. Size: from 0.5 to 5 mm thickness now 200 mm x 600 mm (could be longer). Good mechanical properties but tried only with Densimet (NiFe). Next step: try it with Inermet (CuNi).

  10. Veto Calorimeter Beam Very preliminary ideas on a possible prototype MC calculations correct for W ? (invisible energy, neutrons) Depth ? Width ? Sampling rate, fraction?

  11. Shower Geometry (W 10mm, gap 8mm)Calculations done by C. Grefe Depth [mm] Length [mm] E [GeV] E [GeV] r [mm] L D r E [GeV]

  12. Very preliminary ideas on a prototype Start with a small size but build in an extendable way Production techniques for a later calorimeter should be used ADP or SiPM Wavelength shifter ~5 Scintillator tile 12 20 W plate ~30 ~480

  13. Conclusions • Non brittle Tungsten (alloy, W≥90%) plates are available • Mechanical properties ok, magnetic properties to be verified • Size today somehow small (< 0.3 m2), but can be developed • Envisage construction of a small but extandable prototype?

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